Process of producing composite sheets of safety glass



Feb. 28, 1933. c. H. H. LAMBERTY ,6

PROCESS OF PRODUCING COMPOSITE SHEETS OF SAFETY GLASS Filed Dec. 22, 1930 x l\ \\\\x J'NVENTOR.

CONRAD HUBERT HERRMANN LAHBERTY.

ATTORNEY. @a 440 Patented Feb. 28, 1933 UNITED STATEST'PAT-ENT: orrics CONRAD HUBER-'1 HEBRMZANN LAMBEBTY Q1! LONDON ENGLAND, ASSIGNOB. 01 ONE- HALF TO EDWARD BHKELEYCHEBLTON WOODBURY, OF LONDON, ENGLAND rnocnss or imonucme courosr'rn SHEETS or SAFETY GLASS Application filed December 22, 1930, Serial No. 504,163, and in Great Britain July 22, 1980.

The invention is concerned ,with the manufacture of What IlS commonly called safetyglass, that is'to say a composite sheet composed of glass sheets with an intermedlate layer tending to preventing splintering of the glass in case of fracture. 4

An intermediate layer of gelatine has been used in some cases, and I in my invention use a sheet of gelatine. I

For uniting the sheet of gelatine with the glass sheets I coat the glass sheets, as by dipping, with a mixture of pure glycerine and acetic acid, Without admixture, of isinglass or gum such as has heretofore been introduced where a composition containing glycerine and acetic acid was used and after bringing the sheets together I apply pressure to the assembled sheets, as by means of a roller press, with rubber rollers, through which the composite sheet is passed.

The edges of the composite sheet may be sheets a sheet of solid gelatine, and uniting the three sheets by pressure.

CONRAD HUBERT HERR MANN LAMIERTY.

sealed by applymg thereto an alcoholic solution of collodion.

A portion of a composite sheet according to the invention is shown in section in the accompanying drawing, in which A and B represent respectively the :two glass sheets, and C represents the gelatine sheet, D being the thin coating sealing the edge. The films of binding material attaching the gelatine sheet to the glass sheets are marked E.

The proportions in which the glycerine and aceticacid are used vary accordin to climatic conditions at the time of m'anu acture, the proportion of acetic acid ranging in general from about 15% to about 25% by weight.

The glycerineshould be of high grade as regards chemical purity. V a

The gelatine sheet, transparent or coloured, may be made by any of the current commercial processes by which gelatine sheeting is prepared, for example, for packing purposes, but it should of course be free from the coating or varnish commonly applied to gelatine sheeting intended for packing purposes.

The gelatine sheet may be decorated or printed if desired, as for example for advertising purposes.

What I claim as my invention and desire 

